As they prepare to face the Indianapolis Colts, the Titans had some encouraging developments on their offensive line Friday. But a notable concern popped up elsewhere on the offense.

Right tackle Jack Conklin, who suffered a concussion in the Titans’ Week 9 game against the Dallas Cowboys, has cleared concussion protocol, Titans coach Mike Vrabel said, and is primed to return Sunday. Conklin missed last Sunday’s game against the Patriots, with Dennis Kelly playing in his place.

Offensive guard Corey Levin, who missed practice on Wednesday and Thursday with an illness, was a full participant at Friday’s practice and appears ready for Sunday. That could loom large if starting left guard Quinton Spain, who is labeled as questionable for Sunday, is unable to play. Spain didn’t practice Wednesday with an ankle injury, then left Thursday’s practice after only a few minutes, but was back to limited participation Friday.

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Titans linebacker Derrick Morgan (91) walks off the field with his son Elias after the team's 33-17 loss to the Colts at Nissan Stadium Sunday, Dec. 30, 2018, in Nashville, Tenn. George Walker IV / Tennessean.com

Titans running back Derrick Henry (22) walks along the sidelines in the closing minutes of the team's 33-17 loss to the Colts at Nissan Stadium Sunday, Dec. 30, 2018, in Nashville, Tenn. George Walker IV / Tennessean.com

Red Sox star and American League MVP Mookie Betts, an Overton High graduate, takes the field as the Titans 12th man before the game at Nissan Stadium Saturday, Dec. 22, 2018, in Nashville, Tenn. Andrew Nelles / Tennessean.com

Titans running back Derrick Henry (22) runs away from Jaguars cornerback Jalen Ramsey (20) for his fourth touchdown of the game in the third quarter at Nissan Stadium Thursday, Dec. 6, 2018, in Nashville, Tenn. George Walker IV / Tennessean.com

Titans running back Derrick Henry (22) celebrates his third touchdown with his teammates in the third quarter at Nissan Stadium Thursday, Dec. 6, 2018, in Nashville, Tenn. George Walker IV / Tennessean.com

Titans wide receiver Tajae Sharpe (19) celebrates as he walks off the field after the 26-22 win over the Jets at Nissan Stadium Sunday, Dec. 2, 2018, in Nashville, Tenn. George Walker IV / Tennessean.com

Titans quarterback Marcus Mariota (8) scrambles away from Texan defenders for a first down in the second quarter at NRG Stadium Monday, Nov. 26, 2018, in Houston, Texas. George Walker IV / Tennessean.com

Titans tight end Jonnu Smith (81) pulls away from a Texans defender to score the team's first touchdown in the first quarter at NRG Stadium Monday, Nov. 26, 2018, in Houston, Texas. George Walker IV / Tennessean.com

Titans inside linebacker Wesley Woodyard (59) stops Colts tight end Jack Doyle (84) as he dives for a first down in the second quarter at Lucas Oil Stadium Sunday, Nov. 18, 2018, in Indianapolis, Ind. George Walker IV / Tennessean.com

Tennessee Titans quarterback Marcus Mariota (8) passes the ball during the first half of an NFL football game against Los Angeles Chargers at Wembley stadium in London, Sunday, Oct. 21, 2018. Matt Dunham, AP

Los Angeles Chargers wide receiver Keenan Allen (13), top left, is tackled during the first half of an NFL football game against Tennessee Titans at Wembley stadium in London, Sunday, Oct. 21, 2018. Matt Dunham, AP

Tennessee Titans wide receiver Nick Williams drops a pass from quarterback Marcus Mariota near the end zone during the second half of an NFL football game against the Buffalo Bills, Sunday, Oct. 7, 2018, in Orchard Park, N.Y. Jeffrey T. Barnes / AP

Titans cornerback Dane Cruikshank (29) jumps into the fans after his touchdown in the first quarter against the Texans at Nissan Stadium Sunday, Sept. 16, 2018, in Nashville, Tenn. George Walker IV / Tennessean.com

Sept. 9: Dolphins 27, Titans 20 --
Titans quarterback Marcus Mariota (8) walks off the field after the team's loss to the Dolphins as he is patted on the back by Dolphins quarter back Luke Falk at Hard Rock Stadium Sunday, Sept. 9, 2018, in Miami Gardens, Fla. George Walker IV / Tennessean.com / Tennessean.com

Titans players sit in the hallway outside their locker room during a weather delay during their game against the Dolphins at Hard Rock Stadium Sunday, Sept. 9, 2018, in Miami Gardens, Fla. George Walker IV / Tennessean.com

WRs Taywan Taylor, Tajae Sharpe questionable

The biggest surprise on Friday’s injury report was the addition of Tajae Sharpe, who was not included on the injury report Wednesday or Thursday. The wide receiver was a limited participant at Friday's practice with an ankle injury, and is officially questionable. It's unclear if it's the same ankle that Sharpe injured during warmups against the Cowboys.

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The Tennessee Titans shocked the world when they beat the New England Patriots. Now the program is looking at a Wildcard slot in the NFL playoffs.
Nashville Tennessean

That news is compounded by wide receiver Taywan Taylor missing a third straight day of practice with a foot injury. After practice, Taylor said his foot was feeling better — there’s still some soreness, he said, but less stiffness — and said he’ll be a game-time decision. It’s hard to see him suiting up after missing the entire practice week, though.

The Titans, thin at wide receiver as it is, would be in a tough spot if Sharpe and Taylor, the team's Nos. 2 and 3 receivers, respectively, are unable to play. Cameron Batson and Darius Jennings, who have had a solid impact in the Titans' two games since their Week 8 bye (combining for six catches for 93 yards over that span), would be thrust into important roles behind No. 1 receiver Corey Davis.

OLB Derrick Morgan close to return

Outside linebacker Derrick Morgan was a full participant Friday for the second straight day and is "closer" to making a return, Vrabel said. "We'll see on Sunday."

Morgan, who has been dealing with a shoulder injury, has not played since the Titans' Week 6 loss to the Ravens. Before that, the nine-year veteran had gotten off to an awfully slow start, with just eight tackles (and no sacks) through the first six games.

Reach Erik Bacharach at ebacharach@tennessean.com and on Twitter @ErikBacharach.

Titans running back David Fluellen (32) gestures to the crowd as he is carted off the field after an injury in the second quarter at Nissan Stadium Sunday, Nov. 11, 2018, in Nashville, Tenn. George Walker IV / Tennessean.com

Titans strong safety Kenny Vaccaro (24) pounds his chest after a stop in the first quarter against the Patriots at Nissan Stadium Sunday, Nov. 11, 2018, in Nashville, Tenn. George Walker IV / Tennessean.com

The ball pops out of bounds after a long gain by Titans tight end Jonnu Smith (81) defended by Patriots cornerback Stephon Gilmore (24) in the first quarter at Nissan Stadium Sunday, Nov. 11, 2018, in Nashville, Tenn. Andrew Nelles / Tennessean.com

Ed Lasater, of Orange Park, Fla., tailgates with other fans outside of Nissan Stadium in Nashville, Tenn., before the game between the Tennessee Titans and the New England Patriots Sunday, Nov. 11, 2018. Andrew Nelles / Tennessean.com

Titans head coach Mike Vrabel, a former Patriots player, chats before the game with Patriots owner Robert Kraft at Nissan Stadium Sunday, Nov. 11, 2018, in Nashville, Tenn. George Walker IV / Tennessean.com

Titans offensive tackle Taylor Lewan (77) fist bumps a member of the military before the start of the game against the Patriots at Nissan Stadium Sunday, Nov. 11, 2018, in Nashville, Tenn. George Walker IV / Tennessean.com

Titans strong safety Kenny Vaccaro (24) strikes a pose with a member of the military before the pregame ceremonies at Nissan Stadium Sunday, Nov. 11, 2018, in Nashville, Tenn. Andrew Nelles / Tennessean.com

Cody Waggoner of Murfreesboro, Tenn., throws a football outside of Nissan Stadium in Nashville, Tenn., before the game between the Tennessee Titans and the New England Patriots Sunday, Nov. 11, 2018. Andrew Nelles / Tennessean.com

Toi Beckworth, of Southaven, Miss., plays a game of connect four outside of Nissan Stadium in Nashville, Tenn., before the game between the Tennessee Titans and the New England Patriots Sunday, Nov. 11, 2018. Andrew Nelles / Tennessean.com

The Blue Crew Drumline performs outside of Nissan Stadium in Nashville, Tenn., before the game between the Tennessee Titans and the New England Patriots Sunday, Nov. 11, 2018. Andrew Nelles / Tennessean.com

Camille Powell, of Jackson, Tenn., has her face painted outside of Nissan Stadium in Nashville, Tenn., before the game between the Tennessee Titans and the New England Patriots Sunday, Nov. 11, 2018. Andrew Nelles / Tennessean.com

Freedom Hobbs of Piggott, Ark., rides the zipline with his son Devan Hobbs, 12, outside of Nissan Stadium in Nashville, Tenn., before the game between the Tennessee Titans and the New England Patriots Sunday, Nov. 11, 2018. Andrew Nelles / Tennessean.com

Fans wait to cross the street outside of Nissan Stadium in Nashville, Tenn., before the game between the Tennessee Titans and the New England Patriots Sunday, Nov. 11, 2018. Andrew Nelles / Tennessean.com

Titans wide receiver Tajae Sharpe (19) hauls in a catch during warmups before the game against the Patriots at Nissan Stadium Sunday, Nov. 11, 2018, in Nashville, Tenn. George Walker IV / Tennessean.com